Wooden chairs add warmth and character to any space, but they're vulnerable to dry rot—a fungal decay that occurs when moisture infiltrates untreated wood. Preventing this damage requires a multi-faceted approach focusing on moisture control, protective treatments, and regular maintenance. The most effective prevention begins with keeping wooden chairs in climate-controlled environments with stable humidity levels (ideally 30-50% relative humidity). Apply quality wood preservatives containing fungicides like borate solutions, which penetrate deep into wood fibers to create a hostile environment for fungi. For existing chairs, sand and reseal surfaces annually with UV-resistant polyurethane or lacquer to create moisture barriers. Ensure proper ventilation in storage areas and never place chairs directly on damp surfaces. Regularly inspect for early signs of damage: musty odors, cracking wood, or discoloration. For maximum protection, combine moisture control with periodic applications of oil-based treatments (linseed or tung oil) that nourish wood while repelling water. Remember that prevention is always more effective than treatment—proactive care preserves wooden chairs for generations.